Difference | 2-Stroke Engine, 4-Stroke Engine

Ambarish Ganesh · 2013-07-17T22:26:07+00:00

Listed below is the difference between 2-Stroke and 4-stroke engines: In case of two stroke engine, rotation of crank shaft will be power stroke for every one rotation. During compression stroke, fuel will flow towards the crank case(suction) and during power stroke, exhaust will emit the burnt fuel through the transfer ports. While in case of four stroke engine, rotation of crank shaft will be power stroke for every two rotation. Moreover, suction compression power and exhaust strokes are separate as there will be inlet and exhaust valves. Image via: 4Stroke Machines

Difference | 2-Stroke Engine, 4-Stroke Engine

Ambarish Ganesh
@ambarish-PQyoXg

Updated: Oct 27, 2024

Views: 6.1K

Listed below is the difference between 2-Stroke and 4-stroke engines:

In case of two stroke engine, rotation of crank shaft will be power stroke for every one rotation. During compression stroke, fuel will flow towards the crank case(suction) and during power stroke, exhaust will emit the burnt fuel through the transfer ports.

While in case of four stroke engine, rotation of crank shaft will be power stroke for every two rotation. Moreover, suction compression power and exhaust strokes are separate as there will be inlet and exhaust valves.

Image via: 4Stroke Machines

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Kaustubh Katdare

Administrator • Jul 17, 2013

Great thread, #-Link-Snipped-#! I remember an old discussion on CE about 6-stroke engines: <a href="https://www.crazyengineers.com/threads/six-stroke-engine.446">Six stroke engine</a> . Does it matter here?

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Sarathkumar Chandrasekaran

Member • Jul 18, 2013

In four stroke-there was individual stroke for both suction and exhaust.But in case of two stroke engine there were only two strokes namely compression and power(no suction and exhaust) stroke.Two stroke engines drawback is of lower efficiency,scavenging loss etc.Four stroke has a better efficiency and no scavenging loss.Two stroke engines produce more pollution compared to four stroke engines.In two stroke engines , a seperate transfer case is present.Ports are present only in two strokes.

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Farhan afaaq

Member • Oct 22, 2016

Awesome answer.

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